Adjusting device for rotary piston pumps



March 18, 194-11. P. LORANGE ADJUSTING DEVICE FOR ROTARY PISTON PUMPS Filed Jufie 19, 19:9

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'UNETED STATES PATENTOFFICE ADJUSTING DEVICE FOR ROTARY PISTON PUMPS Prosper LOrange, Stuttgart- Feuerbach, Germany; Rudolf LOrange executor of the estate of -said Prosper LOrange, deceased Application June 19, 193.9, SerialNo. 279,977 In Germany June'2ll, 193.8

6 Claims.

This invention relates to means for angularly adjusting the position of the piston relatively to the cylinder in which it works of rotary piston pumps for the purpose of adjusting the output of the pump for a given number of. reciprocations of the piston per unit of time in the operation of the pump.

It is known that the angular adjustment of the piston in such pumps has to be efiected with a high degree of accuracy and it is very desirable that the measure of the adjustment that has been effected in the one direction or the other shall be definite and known, particularly when an adjustment 0 made. I-Ieretofore this has not been possible with the forms of a very small magnitude is of adjusting means that have been used, which have generally involved the use of parts which, to effect an adjustment, have required to be unclamped and then reclamped again in their adjusted relative positions. As

will be understood, an arrangement of this character does not enable a fine adjustment of a definitely known magnitude to be obtained, at any rate with ease, and in addition the parts that are clamped together may tend to work loose with consequent disturbance of the adjustment that has been effected. In addition, the arrangements that have been used have generally been such as to necessitate a dismantling of certain parts of the pump to effect the adjustment, which again is a serious disadvantage from the practical point of view.

The object of vide an improve the present invention is toprod construction in these respects,

that is, an improved construction in virtue of which it will bepossible to effect a very fine and accurate adjustment of a definite and known magnitude and without the necessity of dismantling any of the parts of the pump, the arrangement being such, moreover, as will enable the adjustment torapidity.

According to be made with great ease and the invention, an adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, comprises a part which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and which is angularly movable about the axis thereof to effect the angular adjustment or the piston and an posed between and having too intervening coupling ring interthe first part and the second part thed engagement with each of the parts so as positively to couple them together for angular adjustment as one about the said axis .of the parts, which toothed engagement is .of such a character as to enable an angular adjustment to be effected both of the ring relatively to the first part and also of the ring relatively .to the second part with the magnitude of the adjustment per tooth step thereof slightly different in the one case from in the other so that by conjoint adjustment of the ring With T10 adjustment of the relative positions of the parts on either side of it a very fine and definite adjustment of the two parts relatively to one another may be effected, provision being made for relative axial movement of the parts to enable 1 the adjustment of the ring to be effected.

According to a preferred form of the invention, the arrangement is one in which the coupling ring has at one end a number of equally spaced recesses, slots, notches or the like, all hereinafter referred to as graduations and at the opposite end a different number of equally .spaced recesses, slots, notches or the like, all hereinafter referred to also as graduations, and the two parts on either side of the ring which are coupled together thereby carry each a projection adapted to engage in any of the graduations of the corresponding set thereof, the set of graduations at one end of the ring being arranged to co-operate with the projection on the part adjacent that end thereof and the set at the other end of the ring being arranged to cooperate-with the projection on the other part.

The number of graduations at the end of the ring is different from that at the other endthereof by only a small amount, for example one, ;in :which event it will be the case that with a complete rotation of the ring through 360, an adjustment equal only to the graduation angle is obtained, since the efiect of a rotation of the ring is that of a movement equal to the graduation angle, for example, the upper graduation angle divided by the number of the lower graduations.

Itis easily possible, for example by an adjustment of the ring by one graduation tooth towards the right, to obtain an alteration of mm., and with an adjustment towards the left an alteration of mm., and these numerical values may be stamped on the ring.

The-said second part above-mentioned of the adjusting means, that is, thepart which is an- .gularly movable about the common axis of the two parts to effect the angular adjustment of the piston, may be slidably and rotatably mount- 55,5

ed on a sleeve coaxial with the parts and connected to the said first part, that is, the part which is in fixed relationship in the rotational sense with the piston of the pump. In this event, a convenient arrangement is one in which the said second part is normally urged into operative engagement with the coupling ring and the latter with the first part, by a compression spring interposed between the second part and an abutment carried upon the sleeve.

The said second part of the adjusting means may be, for example, a toothed wheel, toothed segment or regulating lever, forming part of a means for automatically regulating the output of the pump.

The invention will now be further described with reference to the accompanying drawing:

Figure 1 of which is generally speaking an external view of the relevant parts of an adjusting means in accordance with the invention, and

Figure 2 is a central longitudinal section through the said parts appearing in Figure 1 taken on the section line 2--2 thereof.

Referring to the drawing, the said relevant parts therein shown comprise an annular member A constituting the part of the adjusting means hereinbefore referred to as the first part. The member A carries in integral connection with it a sleeve A1 and freely revoluble thereon is a regulating toothed wheel B. This wheel constitutes the part of the adjusting means hereinbefore referred to as the second part. A projection C on the underside of the regulating toothed wheel B engages in one of a set of graduations in the form of slots at one end of an intermediate coupling ring E. A stop, in the form of a dowel pin F, mounted on the member A, engages in one of a second set of graduations, also in the form of slots, at the other end of the coupling ring E. The regulating toothed wheel B is forced on to the ring E and the ring E is caused to bear against the member A by means of a compression spring G, the upper end of which abuts against a collar H secured to the upper end of the sleeve A1 by means of a spring ring I. In accordance with the description of the invention earlier given herein, the number of slots at the lower end of the ring E is greater by one than the number at the upper end and it will be understood that the annular member A is in fixed relationship in the rotational sense with the piston of the pump, which as usual occupies a position centrally within the adjusting means comprising the foregoing parts.

What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. An adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and Which is angularly movable about the axis thereof to eifect the angular adjustment of the piston and an intervening coupling ring interposed between the first part and the second part and having toothed engagement with each of the parts so as positively to couple them together for angular adjustment as one about the said axis of the parts, which toothed engagement is of such a character as to enable an angular adjustment to be effected both of the ring relatively to the first part and also of the ring relatively to the second part with the magnitude of the adjustment per tooth step thereof slightly different in the one case from in the other so that by conjoint adjustment of the ring with adjustment of the relative positions of the parts on either side of it a very fine and definite adjustment of the two parts relatively to one another may be efiected, provision being made for relative axial movement of the par-ts to enable the adjustment of the ring to be effected.

2. An adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and which is angularly movable about the axis thereof to effect the angular adjustment of the piston, a sleeve coaxial with the first part and connected thereto, the second part being mounted on the sleeve so as to be freely revoluble and axially slidable thereon, and an intervening coupling ring interposed between the first part and the second part and having toothed engagement with each of the parts so as positively to couple them together for angular adjustment as one about the said axis of the parts, which toothed engagement is of such a character as to enable an angular adjustment to be eifected both of the ring relatively to the first part and also of the ring relatively to the second part with the magnitude of the adjustment per tooth step thereof slightly different in the one case from in the other so that by conjoint adjustment of the ring with adjustment of the relative positions of the parts on either side of it a very fine and definite adjustment of the two parts relatively to one another may be effected.

3. An adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and which is anthe angular adjustment of the piston, a sleeve coaxial with the first part and connected thereto, the second'part being mounted on the sleeve so as to be freely revoluble and axially slidable thereon, an intervening coupling ring interposed between the first part and the second part and having toothed engagement with each of the parts so as positively to couple them together for angular adjustment as one about the said axis of the parts, which toothed engagement is of such a character as to enable an angular adjustment to be effected both of the ring relatively to the first part and also of the ring relatively to the second part with the magnitude of the adjustment per tooth stepthereof slightly different in the one case from in the other so that by conjoint adjustment of the ring with adjustment of the relative positions of the parts on either the sleeve and operative normally to maintain the parts and the ring in operative engagement. 4. An adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and which is angularly movable about the axis thereof to efiect the angular adjustment of the piston and an intervening coupling ring interposed between the first part and the second part and formed at one end with a set of equally spaced tooth-engagement graduations arranged to be engaged one at a time by a projection on the first part and at the other end with a second set of equally spaced tooth-engagement graduations of a different number from the number in the first set and arranged to be engaged one at a time by a projection on the second part,- whereby by conjoint adjustment of the ring with adjustment of the relative positions of the two parts on either side of it, a very fine and definite adjustment of the two parts relatively to one another may be effected, provision being made for relative axial movement of the parts to enable the adjustment of the ring to be effected.

5. An adjusting device for a rotary piston pump in which regulation of the output of the pump is effected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part, which is in fixed relationship in the rotational sense with the piston, a second part which is coaxial with the first part and which is angularly movable about the axis thereofto effect the angular adjustment of the piston, a sleeve coaxial with the first part and connected thereto, the second part being mounted on the sleeve so as to be freely revoluble and axially slidable thereon, and an intervening coupling ring interposed between the first part and the second part and formed at one end with a set of equally spaced tooth-engagement graduations arranged to be engaged one at a time by a projection on the first part'and at the other end witha second set oi equally spaced tooth-engagement graduations of a different number from the number in the first set and arranged. to be engaged one at a time by a projection on the second part, whereby by conjoint adjustment of the ring with adjustment of the relative positions of the two parts on either side of it, a very fine and definite adjustment of the two parts relatively to one another may be effected.

6. An adjusting device for a rotary piston pump in which regulation of the output of the pump is eifected by an angular adjustment of the position of the piston with respect to the cylinder in which it works, which comprises a part which is in fixed relationship in the rota.- tional sense with the piston, a second part which is coaxial with the first part and which is angularly movable about the axis thereof to effect the angular adjustment of the piston, a sleeve coaxial with the first part and connected thereto, the second part being mounted on the sleeve so as to be freely revoluble and axially slidable thereon, an intervening coupling ring interposed between the first part and the second part and formed at one end with a set of equally spaced tooth-engagement graduations arranged to be engaged one at a time by a projection on the first part and at the other end with a second set of equally spaced tooth-engagement graduations of a difierent number from the number in the first set and arranged to be engaged one at a time by a projection on the second part, whereby by conjoint adjustment of the ring with adjustment of the relative positions of the two parts on either side of it, a very fine and definite adjustment of the two parts relatively to one another may be efi'ected; and a compression spring interposed between the second part and an abutment on the sleeve and operative normally to maintain the parts and the ring in operative engagement.

PROSPER LORANGE. 

